Borrowing Facilities (Narrative) (Details) - USD ($)		12 Months Ended
	Dec. 21, 2021	Dec. 31, 2021	Dec. 31, 2020	Jul. 20, 2018
Line of Credit Facility [Line Items]
Credit agreement, secured by percentage of stock of the Company's domestic subsidiaries			100.00%
Credit agreement, secured by percentage of voting capital stock of each direct foreign subsidiary		65.00%
Aggregate maturities of long-term debt and capital lease obligations in 2022		$ 800,000
Aggregate maturities of long-term debt and capital lease obligations in 2023		3,300,000
Aggregate maturities of long-term debt and capital lease obligations in 2024		4,100,000
Aggregate maturities of long-term debt and capital lease obligations in 2025		6,600,000
Aggregate maturities of long-term debt and capital lease obligations in 2026		$ 116,500,000
Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit Agreement capacity	$ 381,000,000			$ 650,000,000
Description of variable interest rate basis		Interest on outstanding borrowings under the Amended and Restated Credit Agreement (other than swingline loans) accrues, at the Company’s option, at (a) the London Interbank Offered Rate (LIBOR) plus the Applicable Rate (as defined in the Amended and Restated Credit Agreement) of approximately 1.0% to 2.0% per annum, depending on various factors, or (b) for U.S. Dollar denominated loans, the base rate (which is the highest of (i) the federal funds rate plus 0.5%, (ii) the Bank of America, N.A. prime rate and (iii) the one month LIBOR adjusted daily plus 1.0%) plus the Applicable Rate of approximately 0.0% to 1.0% per annum, depending on various factors.
Credit Agreement covenant terms		The Amended and Restated Credit Agreement contains certain financial covenants related to interest coverage and debt leverage, and certain customary affirmative and negative covenants, including restrictions on the Company’s ability to incur additional debt and liens, pay dividends, repurchase shares, sell assets and merge or consolidate with other persons. Amounts due under the Amended and Restated Credit Agreement could be accelerated upon specified events of default, including a failure to pay amounts due, breach of a covenant, material inaccuracy of a representation, or occurrence of bankruptcy or insolvency, subject, in some cases, to cure periods.
Federal Funds Rate		0.50%
Credit Agreement [Member] | LIBOR Plus [Member]
Line of Credit Facility [Line Items]
U.S. Credit facility, commitment fee		1.00%
Credit Agreement [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
U.S. Credit facility, commitment fee		0.20%
Credit Agreement [Member] | Minimum [Member] | LIBOR Plus [Member]
Line of Credit Facility [Line Items]
U.S. Credit facility, commitment fee		1.00%
Credit Agreement [Member] | Minimum [Member] | Alternate Base Rate Plus [Member]
Line of Credit Facility [Line Items]
U.S. Credit facility, commitment fee		0.00%
Credit Agreement [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
U.S. Credit facility, commitment fee		0.30%
Credit Agreement [Member] | Maximum [Member] | LIBOR Plus [Member]
Line of Credit Facility [Line Items]
U.S. Credit facility, commitment fee		2.00%
Credit Agreement [Member] | Maximum [Member] | Alternate Base Rate Plus [Member]
Line of Credit Facility [Line Items]
U.S. Credit facility, commitment fee		1.00%
Credit Agreement [Member] | Bank Of America Credit Agreement [Member]
Line of Credit Facility [Line Items]
Credit Agreement description		On July 20, 2018, the Company entered into a $650 million credit agreement (the Prior Credit Agreement) by and among the Company, certain of its subsidiaries, the lenders party thereto and Bank of America, N.A., as Administrative Agent, Swingline Lender and a L/C Issuer. The Prior Credit Agreement was comprised of a five-year $500 million revolving credit facility and a five-year $151 million term loan facility, both which had a maturity date of July 20, 2023. The term loan facility proceeds were used to (i) refinance a portion of existing indebtedness and terminate all commitments under the Company’s prior $430 million credit agreement and (ii) pay the fees, costs and expenses associated with the foregoing and the negotiation, execution and delivery of the Prior Credit Agreement.
Credit Agreement issuer		Bank of America, N.A.,
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit Agreement capacity	$ 250,000,000	$ 500,000,000
Term period	5 years	5 years
Credit Agreement maturity date		Jul. 20, 2023
Possible increase to total commitments under Credit Agreement		$ 100,000,000
Revolving credit facility, available for future borrowings		246,100,000		430,000,000
Letters of credit outstanding amount		$ 3,900,000
Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Credit Agreement maturity date	Jul. 20, 2023
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Credit Agreement maturity date	Dec. 21, 2026
Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Term period	5 years	5 years
Credit Agreement maturity date		Jul. 20, 2023
Term Loan proceeds	$ 131,300,000			$ 151,000,000
Term Loan frequency of periodic payments		quarterly
Derivative Notional Amount		$ 131,300,000
Debt Instrument, Interest Rate, Stated Percentage		2.928%
Principal amount		$ 131,250,000	$ 136,874,000
Term Loan Facility [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Derivative Notional Amount		$ 129,400,000
Term Loan Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Credit Agreement maturity date	Jul. 20, 2023
Term Loan Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Credit Agreement maturity date	Dec. 21, 2026
Term Loan Facility [Member] | Bank Of America Credit Agreement [Member]
Line of Credit Facility [Line Items]
Quarterly principal installments, Percentage		0.625%